body{
    padding: 0;
    margin: 0;
    background-color: #f5f5f5;
}

body ul,body li{
    list-style: none;
}


.main{
    min-height: 100%;
    height: calc(100vh - 100px);
    overflow: hidden;
}

.header{
    height: 40px;
}

.footer{
text-align: center;
background-color: #333;
color: #999;
height: 60px;
line-height: 60px;
}